Mini6410 Backlight driver.

Hi,
I downloaded last update, but I didn't find Backlight driver for Wince6 R3.
Where I can find it?
I'm a satisfied user of mini2440; this board have a complete backlight
driver, but it have only 64M ram instead of 128M of Mini6410; but this one
has not all functionality of the smallest one.

For backlight, I found only some commented lines in:
"C:\WINCE600\PLATFORM\SMDK6410\SRC\DRIVERS\DISPLAY\s3c6410_disp_drv\s3c6410
_disp.cpp"


line: 2265
        // Backlight On
        // TODO: To be Replaced with Backlight Driver

  //m_pGPIOReg->GPFDAT |= (1<<15);                                       
// set GPF[15] to High
       // m_pGPIOReg->GPFCON = (m_pGPIOReg->GPFCON & ~(3<<30)) | (1<<30);  
 // set GPF[15] as Output
    }

and at line: 2292 about same lines for  Backlight OFF.

So, I can hope that this driver will be available in a few days (as I found
in update topic for this board), or I can restore the above lines and use
it with GPIO?

Thanks to all.

nothing??? :(

I found full backlight driver for mini 2440 on BSP package for this board.
It's possible friendlyarm didn't port it to mini6410?

Can someone help me? 
I have no experience to write drivers, so I attached source code of
backlight for mini2440. 
I hope someone can do it.

THANKS.

Hi,

I did some modifications in my project in order to control backlight. I
didn't use that driver, I modified PWM.cpp. Control backlight has to be
done with a PWM signal (like motor control) in some pin (check
schematics!). Then, check CPU datasheet and see what registers has to be
configured for duty cycle control.

Sorry, I don't have more time now... let me know if you understood, I'll
check this topic as soon as possible.

See you!
Leo

Hi yopo, THANKS for your great help.
I found PWM.cpp for mini6410, and from schematics I think you used GPE0 =
PIN 30 lcd connector - PIN 5 CPU.
unfortunately I don't have experience in driver building.
Can yuo share in this topic, your PWM.cpp (and other files if necessary)?
PLEASE.
Thanks again.

mmm... I think my pwm is not useful, because is a very dirty code and the
only thing I did was to change PWM signal from buzzer in mini2440 to pin
for backlight in LCD.

Let's see some things first, do you understand what is a PWM signal?? If
you do, the main thing on this is configure some registers, like frequency
of signal and duty cycle. Frequency must be a constant value, but duty
cycle have to be controled from any application; this value controls
backlight intensity.

CPU has many timers; one of them is associated to PWM what you need, you
have to see pinout of uC.

Looking my datasheet (remember: mini2440), I see this registers:

TCFG0, TCFG1, TCON: basic configurations
TCNTBx:  defines frequency for Timer x
TCMPBx:  defines duty cycle for Timer x (this is what you have to control).

I recommend you this steps:

1- Check this link:
http://geekswithblogs.net/BruceEitman/archive/2010/08/01/windows-ce-usin...
2- Then, read datasheet (PWM section). Identify registers you need (check
pinout!)
3- Check PWM driver, how it is implementated. I don't know what do by
default in mini6410, but in mini2440 it configures PWM signal to buzzer.
So, understand that and then do modifications for use your PWM
 Obs: you will need some application to call driver... do you have any
example in DVDs?? (in mini2440, I used Buzzer app)

See you!
Leo